Answer:
Value of call option = 3.92
Step-by-step explanation:
Stock price - Exercise price, 0
When share price is $57,
Payoff = Max (57 - 70, 0)
Payoff = Max (-13, 0)
Payoff = 0
When share price is $78
Payoff = Max (78 - 70, 0)
Payoff = Max (8, 0)
Payoff = 8
Value of call option = (Expected payoff * Probaliltiy) / (1 + Interest for the period)
Considering probability as 50% for each stock
Value of call option = (0 * 0.5 + 8 * 0.5) / (1 + 0.02)
Value of call option = 3.92